#include <stdio.h>

int main(void)
{
	char ch1, ch2;
	int n1, n2, sum;

	ch1 = getchar();
	ch2 = getchar();
	n1 = ch1 - '0';
	n2 = ch2 - '0';
	sum = n1 + n2;
	printf("sum = %d\n", sum);

	return 0;
}